JS获取周、月、季度日期

效果：

代码：

 //用于获取日期本周、本月、本季度的js
 //Author : guanghe
 //文件引用方法：<script src="${staticPath}/common/js/dateUtil.js"></script>
 /**
  * 获取本周、本季度、本月、上月的开始日期、结束日期
  */
 var now = new Date(); //当前日期
 var nowDayOfWeek = now.getDay(); //今天本周的第几天
 var nowDay = now.getDate(); //当前日
 var nowMonth = now.getMonth(); //当前月
 var nowYear = now.getYear(); //当前年
 nowYear += (nowYear < 2000) ? 1900 : 0;

 //格式化日期：yyyy-MM-dd
 function formatDate(date) {
     var myyear = date.getFullYear();
     var mymonth = date.getMonth() + 1;
     var myweekday = date.getDate();
     if (mymonth < 10) {
         mymonth = "0" + mymonth;
     }
     if (myweekday < 10) {
         myweekday = "0" + myweekday;
     }
     return (myyear + "-" + mymonth + "-" + myweekday);
 }

 //获得某月的天数
 function getMonthDays(theYear, theMonth) {
     var monthStartDate = new Date(theYear, theMonth, 1);
     var monthEndDate = new Date(theYear, theMonth + 1, 1);
     var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
     return days;
 }

 //获得本季度的开始月份
 function getQuarterStartMonth(theMonth) {
     if(!theMonth) {
         theMonth = nowMonth;
     }
     var quarterStartMonth = 0;
     if (theMonth < 3) {
         quarterStartMonth = 0;
     }
     if (2 < theMonth && theMonth < 6) {
         quarterStartMonth = 3;
     }
     if (5 < theMonth && theMonth < 9) {
         quarterStartMonth = 6;
     }
     if (theMonth > 8) {
         quarterStartMonth = 9;
     }
     return quarterStartMonth;
 }

 //获得本周的开始日期
 function ghGetWeekStartDate() {
     var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek + 1);
     return formatDate(weekStartDate);
 }
 //获得本周的结束日期
 function ghGetWeekEndDate() {
     var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek) + 1);
     return formatDate(weekEndDate);
 }

 //获得下周的开始日期
 function ghGetNextWeekStartDate() {
     var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek + 7 + 1);
     return formatDate(weekStartDate);
 }

 //获得本月的开始日期
 function ghGetMonthStartDate() {
     var monthStartDate = new Date(nowYear, nowMonth, 1);
     return formatDate(monthStartDate);
 }

 //获得本月的结束日期
 function ghGetMonthEndDate() {
     var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowYear, nowMonth));
     return formatDate(monthEndDate);
 }

 //获得下月开始时间
 function ghGetNextMonthStartDate() {
     var theYear = nowYear;
     var theMonth = nowMonth + 1;
     if(theMonth == 12) {
         theYear += 1;
         theMonth = 0;
     }
     var nextMonthStartDate = new Date(theYear, theMonth, 1);
     return formatDate(nextMonthStartDate);
 }

 //获得本季度的开始日期
 function ghGetQuarterStartDate() {
     var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
     return formatDate(quarterStartDate);
 }

 //或的本季度的结束日期
 function ghGetQuarterEndDate() {
     var quarterEndMonth = getQuarterStartMonth() + 2;
     var quarterStartDate = new Date(nowYear, quarterEndMonth,
         getMonthDays(nowYear, quarterEndMonth));
     return formatDate(quarterStartDate);
 }

 function ghGetNextQuarterStartDate() {
     var theYear = nowYear;
     var theQuarterMonth = nowMonth + 3;
     if(theQuarterMonth > 11) {
         theYear += 1;
         theQuarterMonth -= 12;
     }
     var quarterStartDate = new Date(theYear, getQuarterStartMonth(theQuarterMonth), 1);
     return formatDate(quarterStartDate);
 }

 //设置查询时间
 function ghSetDate(areaName, inputName, id) {
     var date = $(areaName).children(inputName);
     var dateStart = date.eq(0);
     var dateEnd = date.eq(1);
     switch(id) {
         case "cur_week" :
             dateStart.val(ghGetWeekStartDate());
             dateEnd.val(ghGetNextWeekStartDate());
             break;
         case "cur_month" :
             dateStart.val(ghGetMonthStartDate());
             dateEnd.val(ghGetNextMonthStartDate());
             break;
         case "cur_quarter" :
             dateStart.val(ghGetQuarterStartDate());
             dateEnd.val(ghGetNextQuarterStartDate());
             break;
     }
 }

 //初始化时间区域选择控件
 // name：时间组件选择器name
 function ghInitWidget(name) {
     var areaName = "#" + name + "_date";
     var inputName = "input[name='" + name + "']";
     var str = $("<label id='theLabel' class='control-label'><a id='cur_week'>本周</a>&emsp;<a id='cur_month'>本月</a>&emsp;<a id='cur_quarter'>本季度</a>&emsp;自定义&emsp;</label>");
     $(areaName).before(str);
     //点击区域按钮，高亮并搜索
     $("#theLabel a").click(function() {
         $("#theLabel a").css("color", "#337ab7");
         $(this).css("color", "red");
         ghSetDate(areaName, inputName, this.id);
         $(":button.btn-search1").click();
     });
     //点击日期框，区域选择按钮取消高亮
     $(areaName).children(inputName).click(function() {
         $("#theLabel a").css("color", "#337ab7");
     });
 }